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feat(ecs): #80 entity-pool stats (Pool.live/free/reserved/capacity)
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Ludic's ECS is already pool-based — the allocator recycles freed entity slots
through a freelist (L_alloc pops @L_freen before growing @L_entc), and component
storage is fixed per-entity arrays, so spawn/despawn churn (bullet-hell/horde)
does no per-spawn heap allocation and cannot fragment. Expose that with a Pool.*
namespace so a game can watch reuse: Pool.live (alive now), Pool.free (recycled
slots waiting), Pool.reserved (high-water — stays flat across a steady
spawn/despawn loop, proving reuse not reallocation), Pool.capacity (the fixed
cap). Zero-cost inline reads of the existing counters.

Example pool.ludic proves the key property: after despawn+respawn,
Pool.reserved() stays 3 (freed slot reused) — prints 0 0 3 3 0 2 1 3 0 3 1.
4 docs pages. Full suite 118/0, goldens byte-identical, fixpoint holds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Orkun ÇAKILKAYA 2026-09-02 08:23:58 +03:00
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bump: minor
type: feat
Entity-pool stats (#80). Ludic's ECS is already pool-based: the allocator recycles freed entity slots through a freelist (a `despawn`ed slot is reused by the next `spawn` before any new slot is taken), and component storage is fixed per-entity arrays — so spawning and despawning many entities per frame (bullet-hell / horde) does **no per-spawn heap allocation** and cannot fragment. Exposes that with a `Pool.*` namespace so a game can watch the reuse and budget against the cap: `Pool.live()` (entities alive now), `Pool.free()` (freed slots waiting to be reused), `Pool.reserved()` (high-water — slots ever allocated; stays flat across a steady spawn/despawn loop, the proof that slots are pooled not reallocated), and `Pool.capacity()` (the fixed entity cap). Zero-cost — they read the existing allocator counters inline. Example: `examples/library/pool.ludic`.